For me, when viewing a regular publish collection (intra-segment), shift-selection works every time as long as the starting point is a fresh selection, but if the starting point was already selected (but *not* most selected), it works every other time.

Now that I think about it, I did not think it was even possible to have a selection without a *most* selected (every plugin I've written that deals with selections assumes this will be the case, namely that if there is no most-selected photo, then there is no selection - sounds like Lightroom proper may be doing the same here...) - maybe that's the root of the problem in my case: initial shift-click selection has no most-selected photo.

If the extra step is taken to assure there is a most selected photo before re-doing a shift-click selection, it works every time.

Here's an example about how illogical this whole thing seems to me. GRID is set to 4-across. I click #1. I Shft-Click #3. Now 1,2,& 3 are selected. I shft-click #4: 1-3 are deselected. I click #1. Now I shft-click #4. Now 1-4 are selected. I shft-click #5: 1-4 are deselected. And I don't think it was acting THIS way when I first posted this. Bottom line seems to be that you can select one contiguous group but you must CLICK someplace else first, yet typical Shift-Click action in MAC and PC lets you extend a selection (starting from the original clicked item) by shift clicking elsewhere.

I noticed that if I Click #1 and Shift-Click #4 (no probs) then Click #1 and Shift-Click #4 AGAIN, this second time, only #4 is selected.

If I repeat this sequence a 3rd time it works OK, and a 4th time it doesn't. So it works every other time.

Thanks for the update. I am still not able to get the issue to happen for me. Which publishing service are you using?

Lightroom has a three-state selection model: unselected, selected, and most-selected. To understand what this means, go to Library Grid, and select multiple photos (say #1 through #4). You'll notice the background of the selected images is a lighter gray than the unselected images. Now, click on one of the images (click on the image thumbnail, not the border) within the selection - the rest remain selected, but the one you just clicked is an even lighter gray, which is Lightroom's way of marking it as "most selected".

This comes into play if you have a series of images selected, and press "E" to go to Loupe view - the "most selected" image is the one that will be displayed in Loupe. Or, if you went to Develop, the "most selected" image is the one that will be displayed in the Develop window, but the others will remain selected if you want to do something like sync your changes across the set.

Rob, I can confirm most of that, just not so sure about the 'every other time', I think it's more complicated than that.

Using Win7 64bit, LR3.6.

The issue seems to be that when you do an initial multiple select in any Grid view apart from a Published Services collection (e.g. Folder, All Photographs, Static or Smart Collections), as soon as you shift-click on the last thumbnail in the selection, the FIRST thumbnail in the range becomes "most-selected"....and in this situation you can happily extend the selected range by shift-clicking on another unselected image.

But in a Published Services collection, the first thumbnail in the Grid does NOT get the "most-selected" status, which seems to cause a problem if you attempt to extend the selected range. You can get round this: after you have shift-clicked first and last thumbnail to create the selected range, left-click again on the first thumbnail and it should change to "most-selected", after which you can move further down the grid and extend the range as normal by shift-clicking on another unselected thumbnail. Trouble is, when you do that, the first thumbnail again loses its "most-selected" status, meaning you again have to left-click it if you want to extend the selected range even further.

I guess it'd be a lot easier if we could try get the selection right first time.....lol.

However on my system using the Filmstrip, rather than the Grid, everything works as expected....the first image in the Filmstrip selection becomes "most-selected" (though the same thumbnail in the Grid does not) and so you can happily extend the selection range without any of the above shenanigans.